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Date: Tue, 27 Mar 2018 14:03:39 -0400
From: "Emilio G. Cota" <cota@braap.org>
Message-ID: <20180327180339.GD2693@flamenco>
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Subject: Re: [Qemu-devel] [PATCH v1 04/14] fp-test: add muladd variants
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To: Alex =?iso-8859-1?Q?Benn=E9e?= <alex.bennee@linaro.org>
Cc: qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>, Peter Maydell <peter.maydell@linaro.org>, Laurent Vivier <laurent@vivier.eu>, Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

On Tue, Mar 27, 2018 at 12:33:55 +0100, Alex Bennée wrote:
> Emilio G. Cota <cota@braap.org> writes:
> 
> > These are a few muladd-related operations that the original IBM syntax
> > does not specify; model files for these are in muladd.fptest.
> >
> > Signed-off-by: Emilio G. Cota <cota@braap.org>
(snip)
> > +        case OP_MULADD_NEG_ADDEND:
> > +            res64 = float64_muladd(a, b, c, float_muladd_negate_c, s);
> > +            break;
> > +        case OP_MULADD_NEG_PRODUCT:
> > +            res64 = float64_muladd(a, b, c, float_muladd_negate_product, s);
> > +            break;
> > +        case OP_MULADD_NEG_RESULT:
> > +            res64 = float64_muladd(a, b, c, float_muladd_negate_result, s);
> > +            break;
> >          case OP_DIV:
> >              res64 = float64_div(a, b, s);
> >              break;
> 
> Are there any intrinsics we could use for the hard variant which would
> be useful if we want to run under translation?

I don't know of any portable way of doing this. We could add some
arch-specific code though, suitably ifdef'ed.

		E.